/**
 * Copyright (C) 2011 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.inject.internal;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.inject.spi.Dependency;
import com.google.inject.spi.ProviderInstanceBinding;

/**
 * Adapts {@link ProviderInstanceBinding} providers, ensuring circular proxies
 * fail (or proxy) properly.
 * 
 * @author sameb@google.com (Sam Berlin)
*/
final class InternalFactoryToInitializableAdapter<T> extends ProviderInternalFactory<T> {

    private final ProvisionListenerStackCallback<T> provisionCallback;
    private final Initializable<? extends javax.inject.Provider<? extends T>> initializable;

    public InternalFactoryToInitializableAdapter(Initializable<? extends javax.inject.Provider<? extends T>> initializable, Object source, ProvisionListenerStackCallback<T> provisionCallback) {
        super(source);
        this.provisionCallback = checkNotNull(provisionCallback, "provisionCallback");
        this.initializable = checkNotNull(initializable, "provider");
    }

    public T get(Errors errors, InternalContext context, Dependency<?> dependency, boolean linked) throws ErrorsException {
        return circularGet(initializable.get(errors), errors, context, dependency, provisionCallback);
    }

    @Override
    protected T provision(javax.inject.Provider<? extends T> provider, Errors errors, Dependency<?> dependency, ConstructionContext<T> constructionContext) throws ErrorsException {
        try {
            return super.provision(provider, errors, dependency, constructionContext);
        } catch (RuntimeException userException) {
            throw errors.withSource(source).errorInProvider(userException).toException();
        }
    }

    @Override
    public String toString() {
        return initializable.toString();
    }
}
